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姜黄素类似物MHMD诱导肺癌细胞死亡中的凋亡途径以及肌动蛋白聚合在凋亡过程中的重要作用。

The apoptotic pathways in the curcumin analog MHMD-induced lung cancer cell death and the essential role of actin polymerization during apoptosis.

作者信息

Zhou Guang-Zhou, Cao Fa-Kun, Du Shi-Wei

机构信息

College of Bioengineering, Henan University of Technology, Zhengzhou 450001, China.

College of Bioengineering, Henan University of Technology, Zhengzhou 450001, China.

出版信息

Biomed Pharmacother. 2015 Apr;71:128-34. doi: 10.1016/j.biopha.2015.02.025. Epub 2015 Mar 4.

Abstract

As a mode of cell death, apoptosis could be triggered by the extrinsic, intrinsic mitochondrial and intrinsic endoplasmic reticulum pathways and actin rearrangement is needed during apoptosis. We previously found that one curcumin analog MHMD could induce A549 lung cancer cells apoptosis. But the apoptotic pathways and the actin dynamics during apoptosis are not known. Here, we detected the activation of caspase-3, -8, -9, -12, PARP and the increase ratio of Bax/Bcl-2 by western blotting in MHMD-exposed A549 cells. Alternatively, caspases inhibitors could lead to the disappearance of MHMD-eliciting nuclei fragmentation by Hoechst 33342 staining. Besides, JC-1 and DCFH-DA staining showed the fall of mitochondrial membrane potential and the release of ROS. Moreover, wound healing assay confirmed the MHMD anti-migration ability, which was much more effective than curcumin. Importantly, unlike other anticarcinogenic drugs, MHMD might induce the actin polymerization but not depolymerization in the process of A549 cell apoptosis by phalloidin-FITC staining, which is essential to MHMD-induced extrinsic, intrinsic mitochondrial and intrinsic ER pathways of cell apoptosis.

摘要

作为一种细胞死亡方式,凋亡可由外源性、内源性线粒体和内源性内质网途径触发,且凋亡过程中需要肌动蛋白重排。我们之前发现一种姜黄素类似物MHMD可诱导A549肺癌细胞凋亡。但凋亡过程中的凋亡途径和肌动蛋白动力学尚不清楚。在此,我们通过蛋白质印迹法检测了暴露于MHMD的A549细胞中caspase-3、-8、-9、-12、PARP的激活情况以及Bax/Bcl-2的增加比例。另外,通过Hoechst 33342染色,半胱天冬酶抑制剂可导致MHMD诱导的细胞核碎片化消失。此外,JC-1和DCFH-DA染色显示线粒体膜电位下降和活性氧释放。而且,伤口愈合试验证实了MHMD的抗迁移能力,其比姜黄素更有效。重要的是,与其他抗癌药物不同,通过鬼笔环肽-FITC染色,MHMD可能在A549细胞凋亡过程中诱导肌动蛋白聚合而非解聚,这对MHMD诱导的细胞凋亡的外源性、内源性线粒体和内源性内质网途径至关重要。

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